If A+B+C=pi and A, B, C are acute positi...

If `A+B+C=pi` and A, B, C are acute positive angles and cotA cotB cotC = k, then

`kle (1)/( 3 sqrt( 3))`

`k ge ( 1)/( 3 sqrt(3))`

`k lt ( 1)/( 9 )`

`k gt (1)/( 3)`

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